1 files changed, 29 insertions, 0 deletions
diff --git a/src/Library/Cost.hs b/src/Library/Cost.hs
new file mode 100644
index 0000000..86cabdc
--- /dev/null
+++ b/src/Library/Cost.hs
@@ -0,0 +1,29 @@
+module Library.Cost(
+	cost,
+	nodeCost,
+	listCost
+	) where
+
+
+
+import Data.Maybe
+import Data.Graph.Inductive.Graph( Node )
+import qualified Data.Graph.Inductive.Graph as Graph
+import Library.ProofGraph
+
+
+
+cost :: String -> Int
+cost x = 1
+
+
+nodeCost :: PGraph -> Node -> Int
+nodeCost graph node =
+	let label = fromJust (Graph.lab graph node)
+	    nextCostLayer = map (nodeCost graph) (Graph.suc graph node)
+	in (cost label) + (sum nextCostLayer)
+
+
+listCost :: [String] -> Int
+listCost = sum . (map cost)
+